Late decade

• Hippie era, with 'The'
• Great Society era, with "the"
• Era of liberalization
• Decade with tie-dyed shirts and miniskirts
• "The Help" era, with "The"
• The decade from 1960 to 1969
• Number of fashion items in Mary Quant's era
• Hippie decade

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sixty \Six"ty\, n.; pl. Sixties . The sum of six times ten; sixty units or objects. A symbol representing sixty units, as 60, lx., or LX.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1848 as the years of someone's life between 60 and 69; 1827 as the seventh decade of years in a given century. See sixty .